Log in to your Discover account online or in the mobile app
Find the transaction you want to dispute
Select the option to dispute the charge
Choose the reason for the dispute
Provide any requested details and supporting documents
Submit the dispute
Call Discover Card customer service if you cannot file online
Use the number on the back of your card for immediate assistance
Review your account for temporary credits or updates
Respond promptly to any follow-up requests from Discover
Keep records of all communication and documents related to the dispute